Onestep Laboratories Inc. is dedicated to producing quality, single component QuickBlu® TMB substrate for ELISA testing. QuickBlu® single component TMB substrates have been proven to possess excellent sensitivity and lot-to-lot consistency. QuickBlu® TMB substrates are remarkably stable for up to 4 years at 2 – 8°C. The solution can be concentrated up to 10 times for easy transportation and has been patented in the United States.